A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments
Introduction: The purpose of this study was to evaluate inter-session repeatability, inter-examiner reproducibility and inter-device agreement of corneal power measurements from manual keratometer, autokeratometer, topographer, Pentacam high resolution and IOLMaster. Methods: Two sets of mean cor...
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The Faculty of Medicine, International Islamic University Malaysia
2016
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| Online Access: | http://irep.iium.edu.my/51072/ http://irep.iium.edu.my/51072/ http://irep.iium.edu.my/51072/1/Vol15No1JUNE-2016-069-074.pdf http://irep.iium.edu.my/51072/4/51072_comprative%20study%20on%20the%20inter_session_Scopus.pdf http://irep.iium.edu.my/51072/5/51072_comprative%20study%20on%20the%20inter_session_WOS.pdf |
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iium-510722017-04-18T06:50:53Z http://irep.iium.edu.my/51072/ A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments Md Mustafa, Md Muziman Syah Abdul Mutalib, Haliza Malkeet Singh, Sharanjeet Kaur Mohd. Kamal, Khairidzan RE Ophthalmology Introduction: The purpose of this study was to evaluate inter-session repeatability, inter-examiner reproducibility and inter-device agreement of corneal power measurements from manual keratometer, autokeratometer, topographer, Pentacam high resolution and IOLMaster. Methods: Two sets of mean corneal power measurements (n=40) were compared for inter-session repeatability and inter-examiner reproducibility in each instrument. Repeatability and reproducibility were evaluated by within-subject standard deviation (Sw), coefficient of variation (COV) and intraclass correlation coefficient (ICC). A oneway repeated measures analysis of variance was conducted to compare differences in the corneal power between each instrument pair. The Bland and Altman analysis and Pearson’s correlation were employed to assess agreement and determine strength of relationship between measurements. Results: There were no significant differences in mean corneal power measurements between 2 different visits (p > 0.05). The Sw and COV values between 2 visits were lower than 0.09 D and 0.20 % respectively. The ICCs were stronger than 0.99 in all instruments. For reproducibility of each instrument, differences of the measurements between 2 different examiners were also insignificant (p > 0.05). The Sw and COV values between 2 examiners were lower than 0.11 D and 0.23 % respectively. The ICCs were 0.99 and above in all instruments. The 95% limit of agreement between instruments ranged from -0.29 to 1.13 D and the r-values were stronger than 0.84. Conclusion: The corneal power measurements using these 5 instruments were repeatable and reproducible. These instruments can also be used interchangeably, however the topographer should be used with caution. The Faculty of Medicine, International Islamic University Malaysia 2016-06 Article PeerReviewed application/pdf en http://irep.iium.edu.my/51072/1/Vol15No1JUNE-2016-069-074.pdf application/pdf en http://irep.iium.edu.my/51072/4/51072_comprative%20study%20on%20the%20inter_session_Scopus.pdf application/pdf en http://irep.iium.edu.my/51072/5/51072_comprative%20study%20on%20the%20inter_session_WOS.pdf Md Mustafa, Md Muziman Syah and Abdul Mutalib, Haliza and Malkeet Singh, Sharanjeet Kaur and Mohd. Kamal, Khairidzan (2016) A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments. International Medical Journal Malaysia, 15 (1). pp. 69-74. ISSN 1823-4631 http://iiumedic.net/imjm/v1/download/Volume%2015%20No%201/original_article/Vol15No1JUNE-2016-069-074.pdf |
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Digital Repository |
| institution_category |
Local University |
| institution |
International Islamic University Malaysia |
| building |
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Online Access |
| language |
English English English |
| topic |
RE Ophthalmology |
| spellingShingle |
RE Ophthalmology Md Mustafa, Md Muziman Syah Abdul Mutalib, Haliza Malkeet Singh, Sharanjeet Kaur Mohd. Kamal, Khairidzan A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments |
| description |
Introduction: The purpose of this study was to evaluate inter-session repeatability, inter-examiner
reproducibility and inter-device agreement of corneal power measurements from manual keratometer,
autokeratometer, topographer, Pentacam high resolution and IOLMaster. Methods: Two sets of mean
corneal power measurements (n=40) were compared for inter-session repeatability and inter-examiner
reproducibility in each instrument. Repeatability and reproducibility were evaluated by within-subject
standard deviation (Sw), coefficient of variation (COV) and intraclass correlation coefficient (ICC). A oneway
repeated measures analysis of variance was conducted to compare differences in the corneal power
between each instrument pair. The Bland and Altman analysis and Pearson’s correlation were employed to
assess agreement and determine strength of relationship between measurements. Results: There were no
significant differences in mean corneal power measurements between 2 different visits (p > 0.05). The Sw
and COV values between 2 visits were lower than 0.09 D and 0.20 % respectively. The ICCs were stronger
than 0.99 in all instruments. For reproducibility of each instrument, differences of the measurements
between 2 different examiners were also insignificant (p > 0.05). The Sw and COV values between 2
examiners were lower than 0.11 D and 0.23 % respectively. The ICCs were 0.99 and above in all instruments.
The 95% limit of agreement between instruments ranged from -0.29 to 1.13 D and the r-values were stronger
than 0.84. Conclusion: The corneal power measurements using these 5 instruments were repeatable and
reproducible. These instruments can also be used interchangeably, however the topographer should be used
with caution. |
| format |
Article |
| author |
Md Mustafa, Md Muziman Syah Abdul Mutalib, Haliza Malkeet Singh, Sharanjeet Kaur Mohd. Kamal, Khairidzan |
| author_facet |
Md Mustafa, Md Muziman Syah Abdul Mutalib, Haliza Malkeet Singh, Sharanjeet Kaur Mohd. Kamal, Khairidzan |
| author_sort |
Md Mustafa, Md Muziman Syah |
| title |
A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments |
| title_short |
A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments |
| title_full |
A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments |
| title_fullStr |
A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments |
| title_full_unstemmed |
A comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments |
| title_sort |
comparative study on the inter-session and inter-examiner reliability of corneal power measurement using various keratometry instruments |
| publisher |
The Faculty of Medicine, International Islamic University Malaysia |
| publishDate |
2016 |
| url |
http://irep.iium.edu.my/51072/ http://irep.iium.edu.my/51072/ http://irep.iium.edu.my/51072/1/Vol15No1JUNE-2016-069-074.pdf http://irep.iium.edu.my/51072/4/51072_comprative%20study%20on%20the%20inter_session_Scopus.pdf http://irep.iium.edu.my/51072/5/51072_comprative%20study%20on%20the%20inter_session_WOS.pdf |
| first_indexed |
2023-09-18T21:12:15Z |
| last_indexed |
2023-09-18T21:12:15Z |
| _version_ |
1777411330504916992 |